A piezoelectric buzzer is a sounding body that uses piezoelectric ceramics as an electro-acoustic transducer. The core of this device is a transducer made of a piezoelectric ceramic sheet pasted on a metal sheet, that is, a piezoelectric buzzer sheet. The characteristics of piezoelectric buzzer without radio frequency noise and low power consumption make it highly valued and develop very rapidly.

　　 Principle of Structure
　　The piezoelectric buzzer is mainly composed of a multivibrator, a piezoelectric buzzer, an impedance matcher, a resonance box, and a shell. The multivibrator is composed of transistors or integrated circuits. When the power is turned on (1.5~15V DC working voltage), the multivibrator starts to vibrate and outputs 1.5~2.5kHZ audio signals. The impedance matcher drives the piezoelectric buzzer. Sound.

  product properties
　　 Drive mode: If it is not possible to provide a frequency signal for the buzzer to work, consider using the built-in drive circuit and apply DC voltage. There are also different sound signals of straight tone, quick stutter and slow stutter
　　Size: size will affect frequency, small size will have higher frequency
　　Voltage size: Calculated by VO-P, driven by square wave, the higher the voltage, the higher the volume
　　Pinpitch: There are many specifications of piezoelectric buzzer, and it is often difficult to find exactly the same specifications. You can try it out with the same pitch and close frequency.

　　Folding and editing the driving method of this section
　　Piezoelectric buzzer can be driven by a driving circuit. There are two methods:
　　 Self-excited oscillation is a way to generate sound waves by using the oscillation at the resonance point;
　　 Heterogeneous oscillation is a way of generating sound waves at frequencies far from the resonance point.

　　 Fold and edit the features of this paragraph
Compared with other buzzers, 　　 piezoelectric buzzer has the following advantages:
　　 1. Because there is no movable contact part, it has long life and high reliability. It can be used continuously for more than 10,000 hours. It is a semi-permanent device.
　　 2. No arcing or radio frequency noise, no interference to other lines
　　3, will not cause big vibration due to looseness
　　4. It is controlled by electronic circuit, so it can emit a variety of pleasing sounds, analog sounds, and intermittent sounds. Pure tone, not easily covered by noise
　　 5. With voltage excitation, the current consumption is small, generally below 20mA, not more than 100mA
　　 6. Small and large volume. The volume can reach 70 decibels/20cm, and the component thickness is only 1mm or less
　　7, wide operating temperature range
　　 8. Easy to install, and there is no electromagnetic coil and moving coil, there is no need to worry about insulation deterioration, and there is no possibility of leakage

　　 fold edit this paragraph application
　　 Piezoelectric buzzer actually has three commercial forms, namely piezoelectric buzzer complex, piezoelectric buzzer sounding body and piezoelectric buzzer, to meet the different needs of the market. Regardless of the form, its use is inseparable from the three types of alarm, judgment and notification. The piezoelectric buzzer for alarm is used for fire, smoke concentration, air leakage, anti-theft and automobile alarms. The piezoelectric buzzer for notification is used in fish finder, instrument, medical equipment, vending machine, washing machine, electric stove, etc. As a notification, it is more advantageous than light indication. In addition, the piezoelectric buzzer with analog sound and composite sound can also be used in toys, video games, etc.